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 The trailer air supply valve is the most visible of the air brake valves on an air brake equipped vehicle.

CDL Air Brake Valves

Air brakes valves control, regulate and direct the flow of air through the system.

A water tap, for example is a valve that controls the flow of water into a sink.

The brake pedal, like the water tap, controls the flow of air to the service brake chambers, thus controling the brakes as you're going up and down the road.

See these articles for more information about the air brake valves so that you pass your CDL air brakes first time. 

Automatic Front Wheel Limiting Valve
Bobtail Proportioning Valve
Brake Pedal - Foot Valve OR Treadle Valve
Manual Front Wheel Limiting Valve
One-Way Check Valves
Quick Release Valve
Relay Emergency Valve
Relay Valve
Safety Valve
Spring Brake Modulator (Inversion) Valve
Testing Tractor Protection Valve & System
The Compressor and Build Up Test
Tractor Parking Brake Control Valve
Tractor Protection Valve
Tractor Protection Valve and System
Trailer Air Supply Valve
Two-way Check Valves

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